Process of and mixture for making glass



Patented @et. 3. W22.

stares tantra ALWNDEB. L. DUVAL DADRIAN, OF WASHINGTON, PENNSYLVANIA.

PROCESS OF AND MIXTURE EOE MAKING GLASS,

Ito Drawing.

To all whom it may concern:

.Be it known that T, ALEXANDER L. DUVAL DADRIAN, a citizen of the UnitedStates, residing at Washington, in the county of Washington and State ofPennsylvania,

have invented certain new and useful Tmprovements in Processes of andMixtures for present in the materials ordinarily used for making glass,imparts a greenish color to the lass.

ll ave found that this greenish color can be wholly or partly eliminatedby the addition to the usual glass mixture of a compound of bromine,such as a bromine salt, capable of acting as an oxidizing agent at thehigh temperature at which the glass mixture is heated to melt. Suchbromine com pounds or salts may be magnesium bromide, sodium bromate,etc.

As a specific illustration of the ingredients employed in producing myimproved glass,

the same. may be given as follows:

Sand 1,000 lbs. Soda ash 360 to 380 lbs. Limestone -200 to 220 lbs.Magnesium bromide i% to 50 lbs.

The above ingredients are of course thoroughly mixed and heated in theusual manner so that the mass fuses, to produce the glass. On raisin themixture to the temperature of fusing, t e magnesium bromide partia-llychanges the iron present in the mixture to iron bromide. This ironbromide is volatile at the temperature of the fusion. and passes awayfrom the mixture in the form of a gas. The magnesium bromidealsopartially oxidizes a portion or the remaining portion of the ironpresent, and this oxidized iron does not impart a greenish color to theglass.

The amount of bromine compound or bromine salt employed is variedmaterially Application filed. July 21, 1921. Serial No. 48@,5$2.

depending upon the nature of the bromide compound used, and thecondition of the glass-forming materials, to the results desired.Satisfactory results have been obtained by employing from one-half tofifty pounds of magnesium bromide, or sodium :bromate, in combinationwith the other ingredients above stated.

It is to be understood that the form ofm invention herewith shown anddescribed 1s to be taken as a preferred example of the same, and thatvarious changes may be resorted to in the order of the steps of theprocess, and chemical equivalents employed, without departing from thespirit of my invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. The herein described process of pro ducing glass which issubstantially free from the greenish color imparted thereto by the ironpresent in the usual glass mixture. which consists in adding to theusual glass mixture abromine compound capable of acting as an oxidizingagent at the high fusing temperature of the glass mixture and heatingthe mass to the fusing point.

2. The herein described process of producing glass which issubstantially free from the greenish color imparted thereto by the ironpresent in the usual glass mixture which consists in adding to the usualglass mixture at bromine salt capable of acting as w an oxidizing agentat the high fusing temperature of the glass mixture, and heating themass to the fusing point.

3. The herein described process of pro ducing glass which issubstantially free from the greenish color imparted thereto by the ironpresent in the usual glass mixture, which consists in adding to theusual glass mixture a bromine salt of an alkaline earth metal, andheating the mass to the fusing point.

4. A mixture for producing glass, co1nprising the usual glasscomposition, and a bromine compound.

5. A mixture for producing glass. comprising the usual glasscomposition. and a bromine salt.

In testimony whereof I aflix my signature.

ALEXANDER L. DUVAL d'ADRlAN.

